Carrier 58MCA040-12 furnace filter size
This furnace takes a 16 x 25 x 1 filter (side or bottom return).
Every filter option for this model
| Where return air enters | Filter size (inches) | How many |
|---|---|---|
| side | 16 x 25 x 1 | 1 |
| bottom | 16 x 25 x 1 | 1 |
Where the filter goes
Inside furnace blower compartment (framed cleanable filter). SI p18: 'Factory-supplied washable framed filters are shipped in blower compartment.'
The maker ships a filter with this furnace.
How often to change it
General guidance, not from the maker's table: 1-inch filters every 1 to 3 months; 4- and 5-inch filters every 6 to 12 months. Change sooner with pets, smoking or construction dust.
About this model
| Cabinet width | 17.5 in. |
|---|---|
| Airflow direction | 4-way multipoise (upflow/downflow/horizontal), direct vent |
| Heat input | 40,000 BTU/hr |
| Efficiency (AFUE) | 91.0% |
| Model number note | Docs list unit size as 040-08 etc.; nameplate format is 58MCA + size with series digits (e.g. 58MCA040---08 / series 180) that vary. |
How to read a Carrier model number
Source
- Carrier 58MCA-16SI Installation, Start-up, Operating and Service and Maintenance Instructions (installation manual, page 18): document. Read 2026-11-03.
- 58MCA Product Data (58MCA-10PD), Performance data table (product data / spec sheet, page 13): document. Read 2026-11-03.
Check that the model number on your furnace label matches, and compare with the size printed on your old filter. If they differ, go by the filter that fits your rack.